Clamp.



F. E. R. KRUMHAAR & s. J. MALBoB-UP.

v CLAMP.

dAPPLI'l'IIN FILED MAB.. 31, 1910.

983,148 Patented Jan-31, 1911.

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FREDERICK E. R. KRUMHAAR AND SYLVA J. MALBOEUF, OF CHICAGO, ILLINOIS.

CLAMP.

essaies.

Specification of Letters Patent.

Patented Jan. 3i, 1911.

Application filed March 31, 1910. Serial No. 552,527.

To all whm it may concern:

l'e it known that we, Fnnnnnicn E. R. KRUMHAAR and SYLvA J. MALBOEUF,citizens of the United States, residing at Chicago, in the county ofCool; and State of Illinois, have invented certain new and usefulunprovements'in Clamps, of which the following .is a specification.

This invention relates to a clamp, but more particularly to that type ofela-inps which when used in a suflicient number is adapted principallyfor pressing layers of veneer on superposed series of doors and thelike, and comprises, essentially, a bar provided at one end with a rigidjaw, an arm slidably mounted on the bar, and provided with a clampingscrew which, in turn, is provided with a pressing jaw, between whichlatter and the rigid jaw the work is clamped.

Still more particularly, however, the present invention relates tomeans, carried by the sliding arm, which will permit said arm to be slidalong the bar until the pressing jaw comes into cont-act with the work,when a half turn or so ofthe clamping screw will cause the means to biteinto the edge of the bar and securely hold the arm against furthermovement.

The invention further relates to means for holding the sliding arm atany point on the bar it may be moved to when rthe clamp is not in use.

The principal object of the invention is to provide a clamp of the abovecharacter, in which the means above referred to are rigidly fastened tothe sliding` arm, thereby prevent-ing any possibility of the samebecoming lost, and. which will be strong and. durable, positive inoperation, and at the saine time extremely simple and inexpensive inconstruction.

In the accompanying drawing which forms a part of this specification andin which like reference numerals indicate corresponding parts throughoutthe several views, Figure l is a side elevation of the clamp complete,but partly in section, and Fig. 2 is a vertical sectional view taken onthe line 3 3 of Fig. l. with the bar removed.

Referring specifically to the drawings, l indicates the main bar of theclamp, which may be of any desired length, and which has a rigid jaw 2at its lower end.

The sliding arm is indicated at 3, and has a rectangular opening 4t,formed centrally and vertically through one end, through which the bar lpasses. The length of the opening' l is slightly greater than the widthof the bar, so as to permit thc arm to tilt slightly on the bar. rlheother end of the arm is provided with the clamping screw 5, to the lowerend of which'is fastened the pressing jaw 6.

As shown in Fig. l, the lower end of the screw 5 is fastened to the jawG by means of a set screw T, which enters a groove S formed around thelower end of the screw, and as the diameter of the opening 9, whichreceives the screw, is slightly greater than that of the screw, saidscrew, and consequently the arm 3, will be permitted to tilt a slightdistance when pressure is applied to and removed from the pressing jawlvlounted to the upper edge of the arm 3, adjacent the inner wall of theopening 4, is a dog l0, the outer end of which projects a, shortdistance beyond the said inner wall of the opening and is provided witha series of longitudinal panillel serrations ll, which are adapted tobit-e into the edge of the bar l in a manner to be hereinafter referredto. The dog l is held in position by means of screws l2, and for thepurpose of rigidity it is mounted in a pocket formed on the arm byridges 13.

Clampcd under the outer end of the dog l() is one end of a Vtlat springlll, which eX- tends outwardly and downwardly into 'the opening 4t, andhas itsv free end bearing against the edge of the bar l, for the purposeof normally holding the serrated end 11 of the dog l0 out of engagementwith the adjacent edge of the bar l.

Mounted to the under side of the arm 3, directly below the dog l0, is atooth l which is rigidly held in position by means of screws 16. Thefree sharp end of the tooth is adapted to engage the adjacent edge ofthe bar l to hold the arm 3 on the bar when the clamp is not in use.

in use, the work to be pressed is placed on the rigid jaw Q. The slidingarm 3 is tilted sutiiciently, by pulling upwardly on the clamping screw,to disengage the tooth 15 be allowed to slide down the bar until thepressing jaw (3 comes in contact with the work, when a half turn or soof the clamping screw will cause the screw to tilt toward the bar, andthe serrated end ll of the dog l() to bite into the edge of said bar,and securely hold the arm from slipping upwardly from the edge of thebar. rlhe arm will then i' on the bar. The desired pressure may t-hen beexerted on the work by turning the clamping screw. lVhen it is desiredto remove the work from the clamp, the clamping screw is turned in areverse direction until the pressure is relieved suficient-ly to allowthe screw to be tilted away from the bar, to disengage the end 11 of thedog l0 from the edge thereof, when the arm may be moved higher up on thebar7 to remove the work. The weight of the pressing jaw.l etc., willcause the screw to tilt away from the bar l, and the tooth l5 to engagethe edge of the bar, thereby holding the arm at any point it may bemoved to on the bar, when the clamp is not in use.

From the foregoing, it will be seen that a clamp constructed inaccordance with this invention will be extremely simple, with no looseparts to get out of order, and which will admirably serve the purposefor which it is intended.

le claim:

l. A clamp comprising' a main bar, a jaw thereon, an arm slidablymounted on said bar, a clamping screw working in the outer end of saidarm, and a pressing jaw, carried by said clamping screw7 a dog rigidlymounted on the upper edge of said arm7 and having its outer end providedwith a series of seri-ations which are adapted to engage the adjacentedge of the main bar, when pressureis applied to the aforesaid clampingscrew, a tooth rigidly mounted on the lower end of the arm, below saiddog, and adapted to engage the adjacent edge of the main bar, when theclamp is not in use, and a spring fastened at one end under theaforesaid dog and bearing against the main bar7 to keep the serrated endof said dog normally out of engagement with the edge of said main bar.

clamp comprising a main bar, a aw thereon, an arm slidably mounted onsaid barr` a clamping screw working in the outer end of said arm, and apressing jaw, carried by said clamping screw, a dog rigidly mounted onthe upper edge of said arm, and having its outer end provided with aseries of seri-ations which are adapted to engage the adjacent edge ofthe main bar, when pressure is applied to the aforesaid clamping screw,and a tooth rigidly mounted on the lower end of the arm, below said dog,and adapted to engage the adjacent edge of the main bar, when the clampis not in use.

ln testimony whereof we aiiix our signatures in presence of twowitnesses.

FREDERICK E. R. KRUMHAAR. SYLVA J. MALBOEUF.

ll'litnesses HARVEY T. FLETCHER, ARTHUR VESLEY.

